2. A child moving at constant velocity carries a 2 N ice-cream cone 1m across a level surface. What is the net work done on the ice-cream cone cone: a. O j b. 0.5 j c. 23 j d. 20 j

d

explanation:

v=uf/(u-f)

= 5.10/(5-10) convex lens has positive focal length

=50/-5

=-10 cm (formed at other side)

it would be c. predictability

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

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